You almost never collect the gross claim. The schedule is the opening bid in a negotiation, and the negotiation is where most of the value is won or lost.
A findings schedule says £140,000. The cheque, months later, says £80,000. That is not failure, it is the norm, and understanding why is the difference between an auditor who recovers money and one who builds beautiful schedules nobody pays. findings are negotiated, not litigated: court is slow, expensive, and risks the relationship and the contract itself. So both sides settle, and the lands below the gross claim because some findings are interpretive, evidence is imperfect, and the payor is paying partly to make the dispute go away. The skill is knowing what a finding is really worth, where the leverage sits, and what a realistic recovery range looks like before you ever name a number.